Universal feeding device for wrapping machines, particularly for wrapping machines for sweets



c. TARTARINI 3,283,881

PARTICULARLY Nov. 8, 1966 UNIVERSAL FEEDING DEVICE FOR WRAPPING MACHINESFOR WRAPPING MACHINES FOR SWEETS Filed Feb. 18, 1965 c I M? 1, J a "W A1 "i2 3 k a! E 5 )0 I I .lz... m h 3 i=2 a E! 1 w, w A w K I 3 MM WT? 0.7 W; 5 l w 4 m 1 W w m 3 4/ f0 0 1/ 5 m y a w b im d INVENTOR. w C saveaden-um BY Agent Nov. 8, 1966 c. TARTARINI 3,283,

GB FOR WRAPPING MACHINES, PARTICULAR FOR WRAPPING MACHINES FOR SWEEUNIVERSAL FEEDING DEVI 5 Sheets-Sheet 2 Filed Feb. 18, 1965 INVENTOR. (Ifesqre lmfanm Nov. 8, 1966 c. TARTARINI 3,283,831

UNIVERSAL FEEDING DEVICE FOR WRAPPING MACHINES, PARTICULARLY FORWRAPPING MACHINES FOR SWEETS Filed Feb. 18, 1965 5 Sheets-Sheet 5LNVENTOR. B CQSQTG lmtanni Age mt United States Patent 3,283,881UNIVERSAL FEEDING DEVICE FOR WRAPPING MACHINES, PARTICULARLY FORWRAPPING MACHINES FOR SWEETS Cesare Tartarini, Via Roma 38, ZolaPredosa, Bologna, Italy Filed Feb. 18, 1965, Ser. No. 433,576 Claimspriority, application Italy, Feb. 21, 1964, 4,295/ 64 3 Claims. (Cl.198-24) The present invention refers to a universal feeding device forwrapping machines, particularly for Wrapping machines for sweets.

It is known that particularly in sweets industry one and the samewrapping machine may be easily adapted to operate on products withdifferent shapes and/ or dimensions and to carry out wrappings ofdifferent types. To this purpose it frequently sufiices to adjust orreplace a negligible number of operating members of the wrappingmachine.

It is however, not always possible to feed in the same manner thedifferent products to the wrapping machine so that in such cases thefeeding system has to be changed.

A typical example is the usual wrapping of e.g. rectangular blocks orslabs or small bars of chocolate or the like as compared to the tuftedwrapping of small blocks of chocolate or similar sweets having e.g. afrustoconical or dome topped cylindrical form, which hereinafter will becalled boeri.

Also in this case one and the same wrapping machine may be easilyadapted for both types of wrappings. It is however necessary to deliverthe product with a different orientation. In fact while the chocolateslabs may be fed to the wrapping machine in the flatwise position inwhich the same are disposed on the feeding device, by simply shiftingthem from the feeder towards the wrapping machine, the boeri which aredisposed with their flat bottom on the feeding device, must be deliveredto the wrapping machine in an overturned position, so that thedelivering stage of the feeding operation requires a combination ofrotating and shifting movements.

For this reason the known feeding devices had to be changed when passingfrom one to the other wrapping operation. Furthermore the known feedingdevices for tufted wrapping are complicated and slow in operation, owingto the plurality of movements they have to carry out. As a consequence,also the operation of the wrapping machine must be slowed down, therebygreatly reducing the efficiency of the wrapping machine.

The object of this invention is to provide a feeding device for wrappingmachines apt to function indifferently with products of the normalwrapping type as with those requiring a tuft.

A further object is to make available a feeder which, while being apt todeliver the products to the wrapping machine correctly orientated, willnot limit the operation velocity of the said machine.

A further object is to provide a feeding device for wrapping machineswhich operates at high rhythm even with products requiring a tuft.

A further object of the present invention is to make available a feederof great flexibility, that is capable of being adapted to variousproduct shapes.

Another important object is to provide a feeding device endowed withsafety devices apt to block the action in the case of irregularity inthe flow of products or of their irregular position.

An object is also that of making available a simple and rational feederwhich renders of universal use the machine to which it is coupled, thisbeing already structurally universal.

3,283,881 Patented Nov. 8, 1966 The characteristics and advantages ofthe invention will result clearer from the description of an embodimentpreferred, but not exclusive, of a feeding device according to theinvention illustrated by way of example in the attached drawing inwhich:

FIGURE 1 is a section view along the line II of FIG. 2;

FIGURE 2 is a section view of the feeding device, along the line 11-11of FIG. 1;

FIGURE 3 is a lateral view of the means for blocking the rotary motionof the elements carrying the seizing and pushing members. In therepresentation the part of the supporting box has been omitted;

FIGURE 4 is a schematic and partial view of a wrapping machine to whichthe feeder, the object of the present patent, has been applied;

FIGURES 5 and 6 show details of certain operative members.

Referring to the said figures, in which the same element always retainsits own index number, there is provided a box support 1 inside which isjournalled thereon a driving shaft 2 on which the cams 3, 4, 5 arekeyed. The first two present slots 3a and 4a cut into the facing sides,forming an endless curve, and are thus of the type which determine apositive action both in forward and reverse drive, whereas the cam 5 isof the normal radial action type controlling only one stroke.

Couples of ears 6 and 7 arranged perpendicularly to the said shaft 2rise from the bottom 1a of the box support at opposite sides withrespect to said shaft 2 and have at the summit seats for the pins 8 and9 which thus result parallel to the said main shaft 2.

A lever 10 of the central power type is pivoted on the pin 8, and on thepin 9 are pivoted the levers 11 and 12 the first of which is similar tothat designated 10 and the second in the form of an elbow and having itsfulcrum at the vertex thereof.

The levers 10 and 11 c0-operating with cams 4 and 3 respectively haverollers or followers 10a and 11a in their central part which revolve onpins fixed thereon perpendicularly to the plane in which they oscillate.The rollers are received in the slots 4a and 3a of the cams respectivelywhich thus determine an oscillation of the free extremities of the saidlevers.

A similar roller or follower 12a is provided on the extremity of thelever 12, this roller co-operating with the rim face of the cam 5.

The cams 3 and 4 are of the bilaterally acting type, whereas the cam 5is of the unilaterally acting type.

The free extremities of the levers 10 and 11 are in the form of a forkindicated with the numbers 10b and 11b for the first and second leverrespectively.

A connecting rod 14 is hinged to the fork 11b by means of a pin 13, andconnects the fork to the central part 15a of a trestle piece 15 havingseats on the arms 15b and for the slidabl-e insertion of an extremity ofa tubular or hollow shaft 16, the said trestle piece being slidablyengaged by a sleeve 17 inserted between its arms and fixed to the shaft,thus it is engaged to the shaft such that this can rotate but not slideindependent of it.

The shaft 16 is supported at the opposite end to that carried by thetrestle piece 15 by a bush 18 fixed by screws which engage one of itsflanges, to the front wall 1b of the box support of the device. Betweenthis and the shaft 16, at the end thereof protruding to the outside ofthe box support, there is a seal ring 19 maintained in the seat formedin the boss by a ring 20.

On the end of the shaft 16 which protrudes to the outside there isprovided a ring 21 in anti-friction material acting as a supportingelement for means of seizing or pushing described below and as ananti-friction element for a telescoping shaft 22 inserted inside 16 inwhich it is free to run. Forthe supporting of the said internal shaftthe hollow one also has anti-friction means at its second extremity,constituted by a bush 23.

A trestle piece 24 is engaged with the internal shaft 22, in arotatorily slidable relation, like the trestle piece 15 with the shaft16, which allows the shaft to rotate but which is fixed axially to saidtrestle piece 24 by a sleeve 25 fixed to the said shaft 22 between thearms 24b and 240.

A connecting rod 26 is hinged on the central part 240 of the trestlepiece 24 and connects it to the fork b of the lever 10. The secondextremity of the shaft 22, the first protruding to the outside throughthe hollow shaft, is supported by a boss 27 fixed by screws to the boxsupport at the wall 16 thereof. it is evident at this point how onrotation of the shaft 2 on which the cams 3 and 4 are keyed the shafts16 and 22 run inside their respective bosses and how these, shaping in adesired manner the form of the cams, can follow a certain law in theirrectilinear reciprocal motion, in particular moving with intermittedrectilinear reciprocating motion. It is also clear that again withappropriate shaping of the cams, a relative motion between the twoshafts can be added to the motion thereof relative to the box supportand thus they can actuate seizing members as will be illustrated later.

The articulated levers 11, 14 and 10, 26 form respective kinematicchains through which motion is transmitted from the respective followermembers 11a and 10a to the hollow and telescoping shafts 16 and 22respectively.

On the extreme surface of the boss 18 there is a sleeve 28 having an car2841 extending radially thereto to which is fixed a guide or rod member30 by means of screws. The second extremity of the said guide is joinedby screws 32 to an ear 31a of an element 31 inserted on the boss 27acting as a pivot for it.

The central part 30a of the guide presents a slot inside which thebearings 34 and 35 are inserted acting as fo lers and sustained by pins36 and 37 fixed to the sleeves 1'7 and 25 respectively. Evidently thepresence of the guide or rod member 30 does not prejudice the running ofthe shafts 16, 22 under the action of the cams 3 and 4 as on the otherhand the action of the levers 10, 11 working in cooperation with thesaid cams 3, 4 and the said shafts 16, 22 do not impede a partialrotation of said shafts 16, 22 which can take place by provoking therotation of the sleeve elements 28, 31 which support the guide 30.

The connecting assemblies 15, 34, 36 and 24, 35, 37 are of the bush-locktype.

For the rotation of the guide 30 the element or sleeve member 31 has afork 33, again extending radially as the ear 31a, in which a tie-rod 39is engaged by means of a spherical joint 38, and whose second extremityengages wiith another spherical joint 40, at the extremity 12b of thelever 12 actuated by the unilaterally acting cam 5 which, as alreadysaid determines only one stroke, whereas the return stroke is controlledby a spring 41 acting by tension between the said lever and the pin 42fixed to the wall 1c of the box support. It is clear how the sphericaljoints interposed between the fork 33 and the tie-rod 39 and betweenthis and the extremity 12b of the lever 12 allow the transmission ofmotion, even though they are elements at 90 to each other and movingtheir extremes through circle arcs.

The articulated levers 12 and 39 form a further kinematic chain for thetransmission of motion.

The sleeve 28 in addition to the ear 28a to which the guide 30controlling the rotation of the coaxial shafts 16 and 22 is rigidlyfixed, has a second one again extending radially, indicated by 28b towhich is fixed a plate or stop means 44, by means of the screws 43, ofhard material and conforming to a sector of a circular crown.

A hook or pawl member 45 cooperates with the plate or stop means 44, andis fixed with screws 46 to a radial extension 47a of a sleeve 47 keyedto the end remaining inside the box support of a shaft 48 (the supportof the shaft 48 is formed in the box support at the front wall thereof,and in the figure only the thickening of the wall corresponding to therim of its bearing portion can be seen, and in particular the thickeningwhich acts as the support for the said shaft has not been shown in FIG-URE 3 in order not to impede the view of the elements keyed to theexternal extremity of the said shaft).

A pin 49 is also fixed to the sleeve 47, to which the extremity of astring is anchored (not shown) acting in the sense of engaging the hookor pawl member 45 to the edge of the sector 44. Evidently when thishappens, that is reciprocal engagement between sector and hook, the pairof coaxial shafts can rotate in one sense but cannot return to theinitial posit-ion until the above mentioned reciprocal engagementceases.

' At the extremity of the shaft 48 outside the box support an arm 50 isfixed whose length is such thatits extremity 50a sensibly surpasses theupper face of a plate 51 placed on the prolongation of the upper face ofa conveyor ban-d 5-2 supported by two rollers 53 (of which only one isrepresented) and placed at the side of :a loading hopper 54. Theextremity 50a of the arm 50 is also sensibly developed in width in orderto substantially take care of the whole back edge of the said plate 51on which the products to be wrapped are pushed by the combined action ofthe band and of the products conveyed by this, thus because of the abovesaid pushing action which is exerted on it, the product in the leadengages the extremity 50a of the arm 50 and thus 0vercoming the springengaged on the pin 49, determines the rotation of the lever formed bythe said arm 50, on the shaft 48 and on the hook 45 which disengages thesector 44 and thus, if a product is in such a position as to determinethe above said action, allows the return rotation of the pair of coaxialshafts 16, 22.

It is pointed out that the conveyor 52 performs an intermit-t-ent ortripping motion synchronized with the motion of the feeding device, sothat the conveyor tape advances always in that moment in which theoperative members of the feeding device reach a preestablished position.

In this way a safety blocking device is realized through which thehereinafter described means 55 or 57 and 58 for pushing or seizing ofthe products act only when the said products are in the correct positionand can be handled also by thewr-apping machine, in addition to thefeeder, engaging them with their formed surfaces in the requiredposition.

In FIGURE -3 in addition to the members just described there appears ablade element 55 of right angled form constituting a pusher, joined tothe head ring 21 of the hollow shaft 16, and the length of the armjoined to the shaft 16 is such that its second arm takes up a posit-ionin line with the upper face of the plate 51.

This second arm has a recess 56 and the section thereof extending from50a of the arm 50 onwards, i.e. the part of it that remains positionedabove the plate 51 has a length not greater than the width of a productto be wrapped.

In place of the above described pusher 55 the feeder can be endowed withdifferent seizing members with which to seize the products, effect atransportation and at the same time a partial rotation. The seizingmembers, partially illustrated in FIGURES 1, 4 and 5 are constituted ofblocks 57 and 58 having surfaces shaped so as to couple or mate with theshape of the product to be seized (boero illustrated in FIGURES '4 and 5with the number 59) and fixed by means of screwed adjusting means andsupporting armsor gripping means 60 and 61 conforming substantially to aU shape and having the sides located in different planes such that onrotating they do not interfere with the elevator 62 of the wrappingmachine.

The operation of the feeder described, supposing that the principalshaft 2 be joined for the synchronization to a shaft of the wrappingmachine and supposing also that the conveyor be connected to a suitablesynchronized supply of rotating motion, is the following: the productsare located on the hopper 54, the wrapping machine is put into operationand so also the feeder; then the products are pushed from the hopper 54to the band 52.

For the Wrapping of elements not requiring a tuft the feeder is riggedas illustrated in FIGURE 3, that is with a pusher 55 joined to theextremity 21 of the hollow shaft 16 and whose initial positioncorresponds to that illustrated in the said FIGURE 3, then the forwardor working stroke of the said pusher 55 is that effected with its arm inline with i.e. skimming the upper face of the plate 51.

In the interval between the putting into operation and the arrival ofthe first products at the vactive zone of the feeder, this latter andthe wrapping machine are idling. in fact as regards the former with therotation of the cam group the pair of coaxial shafts 16, 22 advance, andarriving at the point of inversion of the motion they rotate under theaction of the cam 5 and, again under the action of the cam 5, theyremain in the position arrived at and in this position they accomplishthe return stroke. Arriving at the second inversion .point of therunning sense, instead of effecting the return stroke, as the profile ofthe cam 5 would allow and as the spring 41 would effect, they remain intheir position because of the engagement created between the sector 44and the hook 45 biased by the spring connected to its pin 49 and notopposed by the action of the products on the arm 50. Thus the successiveruns or strokes until the arrival of the products, are effected by thecoaxial shafts with their rotation blocked, in which position the pusherhas the active arm raised from the plate 51.

At the arrival of products at the plate 51, and with the action of theseon the arm 50, the rotation of the coaxial shafts is unblocked and thusthe pusher returns to its working position (forward run), effecting atthe end of the forward stroke, also the rotation in order to carry outthe return run raised from the plate, and effecting, at the end of thereturn stroke, a further rotation for the return in the workingposition, this if in the meantime another product has been placed on theplate in such a position that it impedes the reciprocal engagementbetween hook and sector.

As mentioned above the intermittent motion of the tape conveyor is,preferably, so synchronized with the feeding device that the unblockingaction is carried out e.g. during the return stroke of the pusher inraised position.

If on the other hand the wrapping machine and the feeder have to operatewith products requiring a tuft the U supports 60, 61 are fixed at theextremities of both the coaxial shafts 16, 22 together with the relativeseizing blocks. According to the conformation of the supports of theblocks 57, 58 the band 52 is positioned such that the products arrive onthe plate 51 at the seizing blocks 57, 58 when the feeder is in theposition immediately before the beginning of the working run.

In this second case, in which the condition still applies that if aproduct does not press the arm 50,-the feeder continues to travel in theupwardly rotated position, that is disengaged from the zone of the plate51, the feeder works as follows: under the thrust of the band 52 aproduct 59 is carried towards the end of the plate 51 and pushed againstthe arm 50 in the desired moment and it impedes the blocking of therotation of the pair of coaxial shafts. In this position it is seized bythe two seizing blocks 57, 58 the one joined to the hollow shaft 6 16and the other to the cylindrical shaft 22 coaxial to the former.

In fact on rotating the cams 3 and 4, and because of the shape of theconfiguration of the cam slot of these, a relative sliding between thetwo shafts 16 and 22 is determined in the sense of bringing the oneblock near to the other block so that they can seize the productslightly pressing it between themselves, after which they run togetheruntil they carry the seized product outside the plate, then they revolveand the product is carried towards the gripping elements 62 of thewrapping machine which grips it with its formed surfaces.

After the seizing of the boero by the gripping elements 62 of thewrapping machine the two cams 3 and 4 determine the slackening of theseizing action of the blocks 57, 58 and then the elements 62 are lifted,together with the boom. Since the elements 62 are offset with respect tothe axis of the shaft :16 and 22, noninterference occurs during theoperation of these members.

The return of the seizing blocks 57, 58 to the plate 51, can then takeplace. As already said the rotation in the initial position of theblocks 57, 58 can take place only if in the meantime another product hasarrived in the correct position and has actuated the arm 50.

The invention as conceived is susceptible to numerous modificationswithin the field of the inventive concept. Thus for example therectilinear reciprocating motion of the shafts, instead of with cams,levers and connecting rods, can be imparted by cams positionedhorizontally.

Further, the pusher instead of being of simple right angle form andhaving a recess to allow free movement of the arm 50 of the blockingdevice, can be of double right angled shape.

In a further variation the plate 51 at which the feeder works, can havelateral guides in order to impede disalignment of the products. Theguides may define a flored entrance.

In practice the feeder can be constructed of any size, of any shape andof different materials. In addition all the detailed elements can besubstituted by others technically equivalent.

I claim:

1. A feeding device for feeding shaped products to a wrapping machine,which comprises a frame, a hollow shaft supported axially slidable androtatable on said frame, a telescoping shaft slidable within said hollowshaft and coaxial therewith, said telescoping shaft extending beyond theends of said hollow shaft, a first connecting assembly fixed on saidhollow shaft, a second connecting assembly fixed on said telescopingshaft at a portion thereof outside said hollow shaft, a driving shaftspaced from said hollow shaft and supported on said frame, a firstbilaterally acting cam means, a second bilaterally acting cam means anda unilaterally acting cam means, all said cam means being fixed on saiddriving shaft, first kinematic chain means having on one end thereof afollower member bilaterally guided by said first cam means and on theother end thereof a member articulated to said first connectingassembly, a second kinematic chain means having on one end the-reof afollower member bilaterally engaged by said second cam means and on theother end thereof a member articulated to said second connectingassembly, said first and second cam means when rotated by said drivingshaft, imparting through said first and second kinematic chains an axialreciprocating motion to said hollow and said telescoping shafts, a firstsleeve member coaxial with said telescoping shaft and rotatablysupported on said frame near one end of said telescoping shaft, saidfirst sleeve member having a radially projecting portion, a secondsleeve member coaxial with said first sleeve member and rotatablysupported on said frame at a distance from said first sleeve member, arod member fixed on said first and said second sleeve member andextending parallel .to said hollow and said telescoping shaft at adistance therefrom, said rod member sl-ida-b'ly engaging said first andsaid second connecting assembly and allowing a relative movement betweensaid rod memher and said connecting assemblies in the direction parallelto said hollow and said telescoping shafts and preventing relativemovements therebetween in the direction transverse to said rod member, athird kinematic chain means having at one end thereof a unilateralfollower member unilaterally guided by said unilaterally acting cammeans and having at the other end thereof a member articulated to saidradially projecting portion of said first sleeve member, spring meansconnected with one end thereof to said frame and with the other endthereof to said unilateral follower member and resiliently urging saidunilateral follower member against said unilaterally acting cam means,said unilaterally acting cam means, when rotated by said drivingshaft,imparting through said third kinematic chain means a rotatory motion tosaid first sleeve member and there-through to the group including saidrod member, said second sleeve member, said hollow shaft and saidtelescoping shaft; a first gripping means fixed on an end of said hollowshaft and a second gripping means fixed on the end of said telescopingshaft'nearest to said first gripping means, stop means rigid with saidsecond sleeve member, a pawl member normally engaging said stop means toprevent rotation of said sleeve member and, through said rod member, ofsaid hollow and telescoping shafts in an angular position thereof inwhich said unilateral follower member is at the maximum distance fromthe axis of rotation of said unilaterally acting cam means, lever meansconnected with said pawl member, conveyor means for the products to befed, said conveyor means defining a path for said products, said levermeans having an arm reaching into the path of said products and adaptedto disengage said pawl from said stop means when one of said products isurged by said conveyor means against said arm [thereby allowing rotationof said gripping means, said path extending between said first and saidsecond gripping means thereby allowing said gripping means to engage andentrain said products.

2. A device according to claim 1, wherein said first and secondconnecting assemblies are adjustable bushlock members.

3. A device according to claim 1, wherein said hollow and saidtelescoping shafts project overhanging from said frame with the endsthereof carrying said gripping means and said conveyor means is arrangedoutside said frame within the reach of said gripping means.

References Cited by the Examiner UNITED STATES PATENTS 5/1933 Crosbie214147 1/1963 Seidel 214l

1. A FEEDING DEVICE FOR FEEDING SHAPED PRODUCTS TO A WRAPPING MACHINE,WHICH COMPRISES A FRAME, A HOLLOW SHAFT SUPPORTED AXIALLY SLIDABLE ANDROTATABLE ON SAID FRAME, A TELESCOPING SHAFT SLIDABLE WITHIN SAID HOLLOWSHAFT AND COAXIAL THEREWITH, SAID TELESCOPING SHAFT EXTENDING BEYOND THEENDS OF SAID HOLLOW SHAFT, A FIRST CONNECTING ASSEMBLY FIXED ON SAIDHOLLOW SHAFT, A SECOND CONNECTING ASSEMBLY FIXED ON SAID TELESCOPINGSHAFT AT A PORTION THEREOF OUTSIDE SAID HOLLOW SHAFT, A DRIVING SHAFTSPACED FROM SAID HOLLOW SHAFT AND SUPPORTED ON SAID FRAME, A FIRSTBILATERALLY ACTING CAM MEANS, A SECOND BILATERALLY ACTING CAM MEANS ANDA UNILATERALLY ACTING CAM MEANS, ALL SAID CAM MEANS BEING FIXED ON SAIDDRIVING SHAFT, FIRST KINEMATIC CHAIN MEANS HAVING ON ONE END THEREOF AFOLLOWER MEMBER BILATERALLY GUIDED BY SAID FIRST CAM MEANS AND ON THEOTHER END THEREOF A MEMBER ARTICULATED TO SAID FIRST CONNECTINGASSEMBLY, A SECOND KINEMATIC CHAIN MEANS HAVING ON ONE END THEREOF AFOLLOWER MEMBER BILATERALLY ENGAGED BY SAID SECOND CAM MEANS AND ON THEOTHER END THEREOF A MEMBER ARTICULATED TO SAID SECOND CONNECTINGASSEMBLY, SAID FIRST AND SECOND CAM MEANS WHEN ROTATED BY SAID DRIVINGSHAFT, IMPARTING THROUGH SAID FIRST AND SECOND KINEMATIC CHAINS AN AXIALRECIPROCATING MOTION TO SAID HOLLOW AND SAID TELESCOPING SHAFTS, A FIRSTSLEEVE MEMBER COAXIAL WITH SAID TELESCOPING SHAFT AND ROTATABLYSUPPORTED ON SAID FRAME NEAR ONE END OF SAID TELESCOPING SHAFT, SAIDFIRST SLEEVE MEMBER HAVING A RADIALLY PROJECTING PORTION, A SECONDSLEEVE MEMEBR COAXIAL WITH SAID FIRST SLEEVE MEMBER AND ROTATABLYSUPPORTED ON SAID FRAME AT A DISTANCE FROM SAID FIRST SLEEVE MEMBER, AROD MEMBER FIXED ON SAID FIRST AND SAID SECOND SLEEVE MEMBER ANDEXTENDING PARALLEL TO SAID HOLLOW AND SAID TELESCOPING SHAFT AT ADISTANCE THEREFROM, SAID ROD MEMBER SLIDABLY ENGAGING SAID FIRST ANDSAID SECOND CONNECTING ASSEMBLY AND ALLOWING A RELATIVE MOVEMENT BETWEENSAID ROD MEMBER AND SAID CONNECTING ASSEMBLIES IN THE DIRECTION PARALLELTO SAID HOLLOW AND SAID TELESCOPING SHAFTS AND PREVENTING RELATIVEMOVEMENTS THEREBETWEEN IN THE DIRECTION TRANSVERSE TO SAID ROD MEMBER, ATHIRD KINEMATIC CHAIN MEANS HAVING AT ONE END THEREOF A UNILATERALFOLLOWER MEMBER UNILATERALLY GUIDED BY SAID UNILATERALLY ACTING CAMMEANS AND HAVING AT THE OTHER END THEREOF A MEMBER ARTICULATED TO SAIDRADIALLY PROJECTING PORTION OF SAID FIRST SLEEVE MEMBER, SPRING MEANSCONNECTED WITH